netstat command parameters and usage

Common parameters-anplt
-a Display all active connections and the TCP and UDP ports listened by the machine
-l Display the listening server port
-n Use the IP address directly, not through the domain nameServer
-p Program PID and program name using Socket
-r Display routing table
-t Display connection status of TCP transport protocol
-u Display connection status of UDP transport protocol
-w Display the connection status of the RAW transmission protocol

 netstat -anutlp | grep 80tcp6 0 0:::80:::* LISTEN 8218/httpd 

ss (socket statistics) parameters and usage

Common parameters are similar to netstat, such as -anp
-a show all sockets
-l show listening
-n show numeric IP and port, not through domain name server
-pShow corresponding programs that use sockets
-t only show TCP sockets
-u only show UDP sockets
-4 -6 only show v4 or v6V sockets
-s print out statistics.This option does not resolve sockets obtained from various sources.Useful for parsing large sockets counts in /proc/net/top
-0 show PACKET sockets
-w show only RAW sockets
-x show only UNIX domain sockets
-r try domain nameresolve, address/port

ss -anutlp | grep 80tcp LISTEN 0 128 :::80 :::* users:(("httpd",pid=8223,fd=4),("httpd",pid=8222,fd=4),("httpd",pid=8221,fd=4),("httpd",pid=8220,fd=4),("httpd",pid=8219,fd=4),("httpd",pid=8218,fd=4))

statistics (ss -s)ss -sTotal: 599 (kernel 1020)TCP: 9 (estab 1, closed 1, orphaned 0, synrecv 0, timewait 0/0), ports 0Transport Total IP IPv6* 1020 - - - -RAW 1 1 0 0 1 1UDP 6 6 3 3 3 3TCP 8 8 4 4 4 4INET 15 7 8 8FRAG 0 0 0 0 0 0